粒度对高铁三水铝石型铝土矿烧结性能和烧结矿显微结构.pdf

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1、第29卷第2期矿冶工程V0I．29№22009年04月蕾ⅡNGANDM匝TALLURGICALENGINEERGApril2009粒度对高铁三水铝石型铝土矿烧结性能和烧结矿显微结构的影响①朱忠平，姜涛，黄柱成，李光辉，张元波，庄剑呜(中南大学资源加工与生物工程学院，湖南长沙410083)摘要：以某高铁三水铝石型铝土矿为原料，研究了铝土矿粒度对烧结矿产质量指标的影响。结果表明，原料的平均粒度增加，烧结矿转鼓强度和成品率均降低。当平均粒度为1．6～2．4mm时，垂直烧结速度大于30mm／min，利用系数大于1．3t／(m·h)，转鼓强度大于68．5％，成品率大于80．

2、0％，平均粒度在1．8mm左右时垂直烧结速度和利用系数达到最大值。原料的粒度对烧结矿矿相影响不大，但对矿物组成有影响。烧结矿粘结相主要由含铝硅的铁酸钙和含铁硅的铝酸钙组成，当粘结相中铝铁原子比AL／(Al+Fe)小于0．2时形成铁酸钙；当AL／(Al+Fe)比值大于0．2时形成铝酸钙。平均粒度增加，烧结矿中铁酸钙含量减少，铝酸钙增加，铁酸钙由针状、片状向不定形状发展。铁酸钙的含量及铁酸钙的形状决定烧结矿强度。关键词：粒度；高铁i水铝石型铝土矿；烧结性能；显微结构中图分类号：TF521，TF821文献标识码：A文章编号：0253—6099(2009)02—0050—

3、05EfectsofGrainSizeonSinteringPropertiesofHighIronTrihydrateBauxiteandSinterMicrostructureZHUZhong-ping，JIANGTao，HUANGZhu—cheng，LIGuang—hui，ZHANGYuan-bo，ZHUANGJian-ming(SchoolofMineralsProcessing&Bioengineering，CentralSouthUniversity，Changsha410083，Hunan，China)Abstract：Theeffectofgrai

4、nsizeofthebauxiteonthesinteringperformancewasstudiedbyusingahighirontrihydratebauxiteasrawmateria1．Theresultsshowedthatthetumblerstrengthandproductionyieldofthesinterdecreasedwiththeincreasingofaveragesizeoftherawmateria1．Whentheaveragesizewas1．6～2．4mm．theverticalsinteringspeedwasmore

5、than30mm／min．theutilizationtoemcientwasmorethan1．3t／(m·h)，thetumblerstrengthwasmorethan68．5％andtheproductionyieldwasmorethan8O．0％．Whentheaveragesizewasabout1．8mm．theverticalsinteringspeedandutilizationeoemcientattainedthemaximum．Grainsizeoftherawmaterialhadlittleinfluenceonthesintermi

6、neralographybuthadinfluenceonthemineralcomposition．Thebondphaseofthesinterwascomposedofcalci—umferriteandcalciumaluminate．CalciumfetriteformedwhentheatomicratioA1／(Al+Fe)ofthesintermaterialwaslessthan0．2whilecalciumaluminateformedwhentheatomicratioA1／(Al+Fe)wasmorethan0．2．Thecontentof

7、calciumferritedecreasedandthecontentofcalciumaluminateincreasedinthesinterwithfheincreasingoftheaveragesize．Calciumferritedevelopedfromneedleandflakecalciumferritetoamorphousones．Thesinterstrengthwasdeter．minedbythecontentandfoITnofcalciumferrite．Keywords：grainsize；highirontrihydrateb

8、auxit